zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

x^2-9x-5=23

解答

x^{2} - 9 x - 5 = 23

解答

x = \frac{9 + 193}{2}, x = \frac{9 - 193}{2}

+1

十进制

x = 11.44622 \dots, x = - 2.44622 \dots

求解步骤

x^{2} - 9 x - 5 = 23

将

23

para o lado esquerdo

x^{2} - 9 x - 28 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot ( - 28 )}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot (- 28) = 193

x_{1, 2} = \frac{- ( - 9 ) \pm 193}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 9 ) + 193}{2 \cdot 1}, x_{2} = \frac{- ( - 9 ) - 193}{2 \cdot 1}

x = \frac{- ( - 9 ) + 193}{2 \cdot 1} : \frac{9 + 193}{2}

x = \frac{- ( - 9 ) - 193}{2 \cdot 1} : \frac{9 - 193}{2}

二次方程组的解是:

x = \frac{9 + 193}{2}, x = \frac{9 - 193}{2}

作图

流行的例子

16 x^{2} + 16 x + 3 = 0

solvefor x,(y-4)^2+20(x+3)^2=0

so l v e f or x, (y - 4)^{2} + 20 (x + 3)^{2} = 0

x^{2} + 1 2^{2} = 1 4^{2}

15 x^{2} + 2 x + 1 = 0

x^{2} - 4 x - 3 = 2 x